虚拟线程：JVM管理的轻量级线程，数量可以非常大，挂载在平台线程上执行。
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Code dump for 2.16，更多细节参见一键获取谷歌浏览器下载
It’s also possible to abandon the threshold matrix altogether and instead calculate a value for every pixel coordinate at runtime. If the function is simple enough this can be a good and efficient way to break up patterns and create interesting textures.